* {
    margin: 0;
    padding: 0;
}

.box {
    width: 100vw;
    height: 100vh;
}

.header {
    width: 100%;
    height: 13%;
}


.header dl {
    display: inline-block;
    margin: 0 1rem;
    text-align: center;
    width: 2.5rem;
    height: 3.5rem;
}

.header dl:hover {
    color: #fff;
    background-color: #0860FC;
    cursor: pointer;
}

.main {
    width: 100%;
    height: 87%;
    background-color: aqua;
}